5×0.4=2 10-0.9=9.1 3.5+6.5=10 36.3÷100=0.363

6.2÷0.2=31 0.99+0.11=1.1 0.25×0.8=0.2 5.6÷0.4=14

2.14-1.4=0.74 4.2×0.1=0.42 0.21÷0.7=0.3 1.21÷1.1=1.1

3.2×0+3.2=3.2 7.4÷（1-0.9）=743.5-1.5×2=0.5 1.1-1.1÷1.1=0.1．